CN201677114U - Cooling coil pipe and tube sheet inner hole welding device for nitric acid absorber - Google Patents
Cooling coil pipe and tube sheet inner hole welding device for nitric acid absorber Download PDFInfo
- Publication number
- CN201677114U CN201677114U CN2010201597322U CN201020159732U CN201677114U CN 201677114 U CN201677114 U CN 201677114U CN 2010201597322 U CN2010201597322 U CN 2010201597322U CN 201020159732 U CN201020159732 U CN 201020159732U CN 201677114 U CN201677114 U CN 201677114U
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- tube sheet
- cooling coil
- welding
- coil pipe
- inner hole
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Abstract
The utility model relates to the technical field of tube head welding equipment, in particular to a cooling coil pipe and tube sheet inner hole welding device for a nitric acid absorber, and solves the problems of low welding quality and the like of the cooling coil pipe and tube sheet inner hole welding. The structure of the cooling coil pipe and tube sheet inner hole welding device comprises a tube sheet and a cooling coil pipe. One end of an inner hole of the tube sheet is connected with the cooling coil pipe. The outside of the cooling coil pipe at the joint is provided with an argon gas protective cover. The inner hole of the tube sheet is internally provided with a positioning insulation sleeve. The outside of the positioning insulation sleeve is sleeved with an adjustable nut. The positioning insulation sleeve is internally provided with a welding gun head. The utility model can effectively guarantee welding quality of the inner hole welding without adding wires and is favorable for improving tube head welding quality of heat exchange equipment under the stress corrosion working condition.
Description
Technical field
The utility model relates to the tube head technical field of welding equipment, is specially the internal bore welding device of a kind of nitric acid absorber cooling coil and tube sheet.
Background technology
Nitric acid absorber is the equipment of stress of being corrosive, and the slit between cooling coil and the tube sheet is present in the operating mode, has corrosive medium to assemble, and forms certain residual stress, causes stress corrosion; Simultaneously, weld seam is subjected to the positive souring of corrosive fluid, and perishable cracking greatly reduces service life of equipment, so internal bore welding (as Fig. 2) is adopted in the jointing substantive requirements of form of cooling coil and tube sheet.Replacing traditional end face structure with Inner Hole Welded Structure, is the fundamental way that improves pipe-pipe sheet weld joint stress corrosion resistant and crevice corrosion stability.If but the argon shield of the stainless steel material back side is bad, metal meeting oxidation, the weld seam blackening can reduce the equipment decay resistance on the contrary.
The difficulty that cooling coil and tube sheet internal bore welding exist has:
1, because the endoporus (φ 21) of pipe is less, and internal bore welding inconvenience adds silk, and tube wall is very thin again, and weld seam requires one side welding with back formation, so very high to the matching requirements of tube-to-tube sheet connection junction; Cooling tube is a coil pipe again simultaneously, stretches in the tube head to be difficult to guarantee to fit together perfectly with tube sheet, and the clearance control that requires tube-to-tube sheet connection is in certain scope, to guarantee the welding quality of joint.
2, the internal bore welding joint is in tubesheet holes inside, and the observability at welding line joint place is bad, and operation is observed in inconvenience; Simultaneously, joint to reprocess difficulty very big, so stability in the welding process and joint quality have been proposed very high requirement.
3, because cooling tube is a coil pipe, and back side argon shield has certain degree of difficulty, and its form is most important, cause the oxidation of the pipe back side as the protection inefficacy, reduce the corrosion resisting property of tube head.
4, because tube sheet is δ=20mm and two kinds of specifications of δ=30mm, the backstay in the tube head is regulated length and should be regulated in 15～30mm scope, but must guarantee that the head rotary manipulation is stable, to guarantee welding quality.
Summary of the invention
The utility model provides the internal bore welding device of a kind of nitric acid absorber cooling coil and tube sheet for problems such as the welding quality that solves cooling coil and tube sheet internal bore welding and exist are bad.
The utility model is realized by following technical scheme; the internal bore welding device of a kind of nitric acid absorber cooling coil and tube sheet; structure comprises tube sheet; cooling coil; endoporus one end of tube sheet connects cooling coil, is provided with the argon shield cover outside the cooling coil of junction, is provided with the location insulation sleeve in the endoporus of tube sheet; the location insulation sleeve is with adjustable nut outward, in the insulation sleeve of location arc welding gun head is installed.
The utility model is at the cooling coil of nitric acid absorber and the internal bore welding joint geometry of tube sheet; adopt the autompulse rotation argon arc welding of full position; select suitable welding equipment, rational fit-up gap and technological specification parameter; especially adopted the argon shield cover back of the body to protect frock; can guarantee effectively that internal bore welding does not add the welding quality of silk, helps improving the tube head weldquality that stress corrosion operating mode heat transmission equipment is arranged.
Description of drawings
Fig. 1 is the position view of interior cooling coil of nitric acid absorber described in the utility model and tube sheet
Fig. 2 is the A-A cutaway view of Fig. 1
Fig. 3 is the machine equipment structural representation of cooling coil described in the utility model and tube sheet internal bore welding
Fig. 4 is the internal bore welding apparatus structure schematic diagram of cooling coil described in the utility model and tube sheet internal bore welding
1-connects case among the figure, 2-tube sheet 3,4,5-cooling coil, 6-connecting plate, 7-coil pipe base, 8-pressing plate; 9-endoporus rotation argon arc welding position, 10-locating bar, 11-arc welding gun head, 12-adjustable nut; the 13-tungsten electrode, 14-argon shield cover, 15-locatees insulation sleeve, 16-housing screw
The specific embodiment
As schematically shown in Figure 4; the internal bore welding device of a kind of nitric acid absorber cooling coil and tube sheet; structure comprises tube sheet 2; cooling coil 3; endoporus one end of tube sheet 2 connects cooling coil 3, is provided with argon shield cover 14 outside the cooling coil 3 of junction, is provided with location insulation sleeve 15 in the endoporus of tube sheet 2; the insulation sleeve 15 outer adjustable nuts 12 that are with in location are equipped with arc welding gun head 11 in the insulation sleeve 15 of location.
As schematically shown in Figure 3, in the endoporus of tube sheet 2, also be provided with locating bar 10.
Below in conjunction with the description of drawings specific operation process:
1 employing numerical control drilling machine processing pore is φ 25.4mm, with the matching requirements of satisfying tube sheet and the precision that guarantees pore processing; Pipe end face machined into tack.The burr of strict cleaning pore and pipe end face, greasy dirt, moisture etc. before the assembling, and with in acetone soln cleaning weld seam and the nearly seam district 20～30mm scope.
2 in order to ensure when assembling pipe with the concentricity of pore, the machine equipment locating bar 10 (as Fig. 3) of a special use of needs.After having good positioning, do not add silk with the TIG weldering and be welded to joint, spot welding 2 points (differing about 180 °) at least.
The making of 3 argon shield covers 14: consider that heat exchanger tube is a coil pipe in the equipment; conventional back-protective cover can't meet the demands; for ensuring the quality of products; anti-stainless steel tube back side oxidation; adopt the pipe of φ 38 * 2L=100mm to mill out from the centre; end face seals with closure plate, every weldering one tube head, the place's of closing up rubber belt sealing, logical argon gas.Simple, be convenient to operation (as Fig. 4).
The operation principle of 4 internal bore welding devices: select the automatic TIG pulsed argon arc welding in full position for use.Promptly transform common tube head argonaut welding rifle head, and hang on portal frame with balancer, by the distance that rotation adjustable nut 12 is regulated tungsten electrode 13 and weld seam, protective gas is outwards sprayed by mandrel venthole place, discharges the air of weld zone.During welding, tungsten electrode (diameter phi 2.4) position adjustments of arc welding gun head is good, insert in the tubesheet holes, open argon gas, connect ground wire.With light forwards the withstanding of have gentle hands, press the starting switch on the line control machine after, electric arc ignites automatically, has welded automatically decay of back, after waiting that lagging behind supplies gas and stopping, the rifle head is slowly pulled out.
6 because heat exchanger tube is a coil pipe, and tube head internal bore welding fit-up gap is little, and weld seam does not possess observability, reprocesses the comparison difficulty simultaneously, so behind the intact joint of every weldering, test, and according to requirement in the pattern with probe, carry out the water pressure test, qualified after, can carry out assembling, the welding of next tube head; As defective, should reprocess immediately.After whole parts have been made, carry out air-tight test.
The utility model result of use: with special welding jig, carry out strict technological specification and carry out welding operation, equipment is weld bond surplus in the of totally 2000, and first-time qualification rate reaches more than 98%, and this equipment used nearly 2 years, and any stress corrosion cracking situation does not appear in tube head.
Claims (2)
1. the internal bore welding device of nitric acid absorber cooling coil and tube sheet; it is characterized in that: structure comprises tube sheet (2); cooling coil (3); endoporus one end of tube sheet (2) connects cooling coil (3); outside the cooling coil (3) of junction, be provided with argon shield cover (14); be provided with location insulation sleeve (15) in the endoporus of tube sheet (2), the outer adjustable nut (12) that is with of location insulation sleeve (15) is equipped with arc welding gun head (11) in the location insulation sleeve (15).
2. the internal bore welding device of nitric acid absorber cooling coil according to claim 1 and tube sheet is characterized in that: also be provided with locating bar (10) in the endoporus of tube sheet (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201597322U CN201677114U (en) | 2010-04-12 | 2010-04-12 | Cooling coil pipe and tube sheet inner hole welding device for nitric acid absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201597322U CN201677114U (en) | 2010-04-12 | 2010-04-12 | Cooling coil pipe and tube sheet inner hole welding device for nitric acid absorber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201677114U true CN201677114U (en) | 2010-12-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201597322U Expired - Lifetime CN201677114U (en) | 2010-04-12 | 2010-04-12 | Cooling coil pipe and tube sheet inner hole welding device for nitric acid absorber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201677114U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102284774A (en) * | 2011-07-26 | 2011-12-21 | 许晓华 | Welding insulation tool |
| CN102513668A (en) * | 2011-12-31 | 2012-06-27 | 茂名重力石化机械制造有限公司 | Welding gun head for inner hole of sharp quenching heat exchanger |
| CN103920967A (en) * | 2014-02-24 | 2014-07-16 | 中国化学工程第十四建设有限公司 | Absorption tower welding method |
| CN104493341A (en) * | 2014-12-15 | 2015-04-08 | 哈尔滨电气动力装备有限公司 | Welding method for shield sleeve for stator of shield motor and lower flange and equipment used for welding method |
| CN107999933A (en) * | 2017-12-26 | 2018-05-08 | 哈尔滨锅炉厂有限责任公司 | Fountain type stringing inner hole welding of rapid cooling structure and welding method |
| CN111037065A (en) * | 2019-12-31 | 2020-04-21 | 中国科学院上海应用物理研究所 | Welding method for inner hole welding of tube plate of small-aperture heat exchange tube |
| CN113102870A (en) * | 2021-04-25 | 2021-07-13 | 山西丰喜化工设备有限公司 | Inner hole rotating argon arc welding gun head for pipe and pipe plate and welding method |
| CN113399794A (en) * | 2021-06-28 | 2021-09-17 | 上海电气电站设备有限公司 | Special gas protection device for small-diameter pipe and tube plate inner hole welding |
| CN115302050A (en) * | 2022-08-15 | 2022-11-08 | 武昌船舶重工集团有限公司 | Welding method for copper tube and carbon steel joint |
-
2010
- 2010-04-12 CN CN2010201597322U patent/CN201677114U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102284774A (en) * | 2011-07-26 | 2011-12-21 | 许晓华 | Welding insulation tool |
| CN102284774B (en) * | 2011-07-26 | 2013-05-15 | 许晓华 | Welding insulation tool |
| CN102513668A (en) * | 2011-12-31 | 2012-06-27 | 茂名重力石化机械制造有限公司 | Welding gun head for inner hole of sharp quenching heat exchanger |
| CN102513668B (en) * | 2011-12-31 | 2014-04-09 | 茂名重力石化机械制造有限公司 | Welding gun head for inner hole of sharp quenching heat exchanger |
| CN103920967B (en) * | 2014-02-24 | 2016-01-20 | 中国化学工程第十四建设有限公司 | Absorption tower welding method |
| CN103920967A (en) * | 2014-02-24 | 2014-07-16 | 中国化学工程第十四建设有限公司 | Absorption tower welding method |
| CN104493341A (en) * | 2014-12-15 | 2015-04-08 | 哈尔滨电气动力装备有限公司 | Welding method for shield sleeve for stator of shield motor and lower flange and equipment used for welding method |
| CN107999933A (en) * | 2017-12-26 | 2018-05-08 | 哈尔滨锅炉厂有限责任公司 | Fountain type stringing inner hole welding of rapid cooling structure and welding method |
| CN111037065A (en) * | 2019-12-31 | 2020-04-21 | 中国科学院上海应用物理研究所 | Welding method for inner hole welding of tube plate of small-aperture heat exchange tube |
| CN111037065B (en) * | 2019-12-31 | 2021-09-24 | 中国科学院上海应用物理研究所 | Welding method for inner hole welding of tube plate of small-aperture heat exchange tube |
| CN113102870A (en) * | 2021-04-25 | 2021-07-13 | 山西丰喜化工设备有限公司 | Inner hole rotating argon arc welding gun head for pipe and pipe plate and welding method |
| CN113399794A (en) * | 2021-06-28 | 2021-09-17 | 上海电气电站设备有限公司 | Special gas protection device for small-diameter pipe and tube plate inner hole welding |
| CN115302050A (en) * | 2022-08-15 | 2022-11-08 | 武昌船舶重工集团有限公司 | Welding method for copper tube and carbon steel joint |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101222 |
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| CX01 | Expiry of patent term |